About this item Assembly design: The L-shaped base of this three-color signal tower light is detachable, and the type of base you need can be installed freely. High-quality materials: This stacking light is made of high-quality PC aluminum alloy material, which is sturdy and durable. Three colors and buzzer: This stacking light has three colors (red, yellow, green) and 85dB buzzer, which is suitable for the mechanical equipment in the workshop. Good lighting: Warning lights can be seen from a distance.